If you found a “djay 2 for iPhone IPA v2.8.1” online:

: Your existing Cue Points, Loops, and metadata will sync automatically between the old and new versions. Algoriddim Important Security Note on IPA Files System requirements - Algoriddim Support

The v2.8.1 update was significant because it bridged the gap between a toy and a tool. Key features include:

Use the official djay Pro from the App Store or explore free alternatives like Cross DJ or Mixxx (desktop). Avoid downloading IPAs from third‑party sources.